Improvement in stop-valves



UNITED STATES PATENT OFFICE.

RICHARD S. GILLESPIE, OF NEW YORK, N. Y.

IMPROVEMENT IN STOP-VALVES.

Specification forming part of Letters Patent No. 153,561, dated July 28, 1874; application filed J une 6, 1874. v

To all whom it may concern Be it known that I, RICHARD S. GILLEsPIE, of New York city, in the county and State of New York, have invented a new and useful Improvement in Stop-Valves, of which the following is a specification:

Figure l is a side view, partly in section, of a valve to which my improvement has been applied. Fig. 2 is a cross-section of the same. Fig. 3 is a plan of the valve. Fig. 4 shows a modification of the improvement.

Similar letters of reference indicate corresponding parts.

' In double seated valves, as usually constructed, the seats are Wedge-shaped, and the faces of the valve are forced against the seats by a stationary cone at the bottom of the valve-case; or the two parts of the valve hangin g from a central stem are forced, by a downward movement of said stem, into contact with the wedge-shaped seats.

By the first arrangementthat is to say, by the use of the cone-the lower ends of the faces of the valve are brought into contact with the valve-seats; but the upper ends of said faces are not brought into contact with said seats with certainty. In fact, it has been more practical to depend upon wedge-seats and omit the cone entirely,-which cone cannot be used with any certainty of tight joints, except with wedge-seats, so that wedge-seated valves are, in fact, the only practical double-seated valves in practical use.

My invention is an improvement upon double-seated valves, some of which are provided with a headed pin or spreader and two disks by the introduction of rollers that may act on the principle of a toggle-joint, as hereinafter described.

g is the valve-case. a are the valve-seats.

b are the two parts of the valve, in the inner side of the upper ends of which are formed semicircular grooves to receive a circular flange formed upon the lower end of the valvestem f. In the inner the valve are formed shaped recesses,

sides of the parts b of semicircular or wedgein and between which are placed four small rollers or cylinders, 0. Between the upper ends of the parts b of the valve is placed a loose pin, d, the lower end of which rests upon the upper roller 0, and its upper end projects so as to be struck by the lower end of the valve-stem f when the valve has been forced down. ends of the ports I) of the valve is placed a loose pin, 0, upon the upper end of which rests the lower roller e, and its lower end projects so as to strike the bottom of the case y when the valve is forced down. from dropping out by a flange formed upon its upper en d.

By this construction, when the valve is forced down, the pin 0 strikes the bottom of the case 9 and forces the pin d up against the lower end of the valve-stem f. As the valvestem f moves farther down, the pins 0 d are forced inward against the outer rollers e, which force the middle rollers e outward, forcing the faces of the valve against the valve-seats. The rollers 6 thus operate as a double togglejoint, pressing outward in lines at right angles with the valve stem.

In raising or opening the valve, the first movement of the valve stem removes the pressure of the pins d c from the rollers e, the pressure of the rollers efrom the parts I) of the valve, and the pressure of the valve-faces from the valve-seats, so that the valve can be raised without any friction between its faces and seats.

In the modification shown in Fig. 4 only two rollers are used, which will produce the same effect, but in a less perfect and reliable manner.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

The rollers e, combined in the described valve and valve-seat a b, with stem f and pins 0 d, as and for the purpose specified.

- RIOHD. S. GILLESPIE.

Witnesses:

PETER P. KELLER, 0. W. Lumen.

Between the lower The pin cis kept 

